Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e6df766caa12e9…

MALICIOUS

PDF

77.4 KB Created: 2021-06-08 13:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f118a85d75993fe66bef77edff90b77a SHA-1: add132e7dce328d9a4af0a5a2535b40d86246fd5 SHA-256: b0e6df766caa12e978d52486c1a2b02705884546075316580dad2f0748ef475c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/pbw?utm_term=carl+jung+books+read+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427282/normal_600fa4ae13fa0.pdfIn PDF document text
    • https://gojanevalu.weebly.com/uploads/1/3/4/3/134353606/lezemexufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_606aa7dd19d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_601b8d26eafc9.pdfIn PDF document text
    • https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/medagosaxanuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_604fa87f79c3a.pdfIn PDF document text
    • https://madovokego.weebly.com/uploads/1/3/1/4/131409717/88e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_6013a6b31d06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_5fd319b1a21c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443804/normal_5fec9c1dd4b10.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/xirudelenil.pdfIn PDF document text
    • https://jimirona.weebly.com/uploads/1/3/4/2/134266163/0796a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fff4283c882b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144681303/situacion_didactica_sobre_dia_de_muertos_para_preescolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1080db0c-687b-4f5f-a9e9-c7bf44063feb/98837327013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0748c0-1a24-454f-80ed-96cfa3b9bd87/dunapusobinuvibir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a014d7d-ac55-4c62-96c9-3b0613bde84c/73959419283.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144511122/rita_mulcahy_pmp_9th_edition_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 5180 bytes
SHA-256: 947ef18ccc31a7235d771303d0339fe43ba84b814efbefc64e138e91d7de66a1
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 10872 bytes
SHA-256: 01ef6a2ca358bfff50225572e3c4a7cf4b90b666ff15f4199ef21213615843b0

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